prim算法的简化版本，很好用，可以用作模板。-prim algorithm is a simplified version, very good use, can be used as templates.

用于求解旅行商最短路径问题的Prim算法，是一种经典的构造型算法，可用于论文实验的对比参照-Prim shortest path algorithm is used to solve the traveling salesman problem, is a classic stereotype algorithm can be used to compare the experimental reference papers。